|
xi |
fi |
f ixi |
|xi - |
fi|xi - |
|
10 |
4 |
40 |
40 |
160 |
|
30 |
24 |
720 |
20 |
480 |
|
50 |
28 |
1400 |
0 |
0 |
|
70 |
16 |
1120 |
20 |
320 |
|
90 |
8 |
720 |
40 |
320 |
|
Total |
80 |
4000 |
1280 |
|
= 4000/80 = 50
M.D (
) = 1280/80 = 16
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